Advertisements
Advertisements
प्रश्न
The best way to recover sugar from an aqueous sugar solution is :
पर्याय
evaporation to dryness
distillation
filtration
crystallisation
Advertisements
उत्तर
crystallisation
Crystallisation is a better technique to recover sugar from sugar solution because sugar decomposes or gets charred on heating. Also, the soluble impurities get removed by crystallisation.
APPEARS IN
संबंधित प्रश्न
What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain during Brownian motion.
When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.
- What could particles X be ?
- What do you think liquid Y is ?
- What is the zig-zag movement of X known as ?
- What is causing the zig-zag movement of particles X ?
- Name the scientist who discovered this phenomenon.
- What does this experiment tell us about the nature of liquid Y?
What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
State whether colloidal solutions are homogeneous or heterogeneous.
Calculate the concentration of a solution which contains 2.5 g of salt dissolved in 50 g of water.
Which of the following contains less solute at a given temperature and pressure ? Unsaturated solution or Saturated solution.
Fill in the following blank :
Milk is a .................... solution but vinegar is a .................... solution.
How will you test whether a given solution is a colloidal solution ?
Explain what happens when a beam of light is passed through a colloidal solution.
Name the different types of solutions. Give one example of each.
One of the following is a solid foam. This one is :
When the solid A is added to water, it dissolves with the evolution of a lot of heat and making little explosions to form two products B and C. The properties of products B and C are entirely different from those of solid A as well as water. Moreover, products B and C cannot be reconverted into solid A and water. When another solid D is added to water, it dissolves with the absorption of a little heat to form a product E which cools down. The product E shows the properties of both, solid D as well as water. Moreover, product E can be converted into solid D and water.
(a) What type of change occurs when solid A is dissolved in water ? Why ?
(b) What type of change occurs when solid D is dissolved in water ? Why ?
(c) Name a metal which you think could behave like solid A. Also name the products B and C.
(d) Name the solid D if it is the one which is used in making ordinary dry cells.
(e) Name the process by which D can be recovered from E.
State whether the following statement are true or false :
Alcohol can be separated from a mixture of alcohol and water by a separating funnel.
How will you separate camphor, common salt and iron nails from their mixture ?
Which one of the following scrap metal cannot be separated by magnetic separation ?
Name one pair of liquids which can be separated by using a separating funnel.
Which among the following is not a matter?
Liquids have ______.
Atoms are tiny particles that repel each other when they are squeezed very close.
Define the term matter.
